<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"> 
    <title>Document</title>
</head>
<body>   
</body>
    <script>
        var a;
        console.log(a);
        a = 10;
        console.log(a);
        var b = a;
        console.log(b);
        var c =a + b;    
        console.log(c);
        var d =c > a;
        console.log(d);


        a = a + 1;
        a += 1;
        a *= 2;
        a /= 3;
        a %= 3;
        console.log(a);












    </script>
</html>